11,043 tests in 2025
Mercedes-Benz Glb reliability and MOT pass rate
91.6% passed first time. The 8.4% fail rate is 14.2 points better than the all-car average, on a median example 4 years old with 32,122 miles.
MOT pass rates / Mercedes-Benz
Pass rate
91.6%
22.6% of all cars failed; 8.4% of these did.
Fixed on the day
1.7%
Passed after a defect was put right during the visit.
Median at test
32,122 mi
4 years old.
Fail rate by age
| Age at test | Tests | Fail rate |
|---|---|---|
| 3-5 years | 10,740 | 8.6% |
| 6-9 years | 0 | — |
| 10-13 years | 0 | — |
| 14+ years | 0 | — |
What the Glb fails on
Share of failed tests with at least one fail item in each DVSA inspection section. A test can fail in several sections at once.
- Tyres304 dangerous53.4%
- Brakes157 dangerous22.4%
- Visibility2 dangerous9.4%
- Lamps, reflectors and electrical equipment8.3%
- Suspension1 dangerous6%
- Seat belts and supplementary restraint systems5.1%
- Identification of the vehicle3.1%
- Noise, emissions and leaks2.5%
Is the Glb getting worse?
The fail rate rose 0.5 points to 8.8% from 2023 to 2025, against a falling rate across all cars.
| Year | Tests | Median age | Fail rate | All cars | |
|---|---|---|---|---|---|
| 2023 | 1,609 | 3 | 8.3% | 22.8% | |
| 2024 | 4,689 | — | 7.5% | 23.2% | |
| 2025 | 8,339 | — | 8.8% | 22.6% |
Fail rate is first attempts at class 4 tests. Median age is the age of a typical Glb at its test that year, and it is the number to watch: across the whole fleet each extra year of age adds roughly 1.9 points to the fail rate, so a model whose age and fail rate rise together is simply getting older.
The exact defects that fail it
Every failure item DVSA recorded against a Glb in 2025, counted by how many tests each one appeared on.
- 1Condition: has a cut in excess of the requirements deep enough to reach the ply or cords263 tests
- 2Brake pads: less than 1.5 mm thick121 tests
- 3Condition: has ply or cords exposed97 tests
- 4Tread depth: tread depth below requirements of 1.6mm95 tests
- 5Wipers: does not clear the windscreen effectively58 tests
- 6Brake pads: worn down to wear indicator56 tests
- 7Horn: not working33 tests
- 8Registration plates: does not conform to the specified requirements27 tests
What wears out first
Advisories are the tester flagging wear that is still legal. A typical Glb collects 2.09 of them per test, and these are the ones that come up most. Treat it as the running-repairs list for the next year or two.
- 1Tread depth: tread depth below requirements of 1.6mm1,200 tests
- 2Brake pads: less than 1.5 mm thick910 tests
- 3Condition: has a tear, caused by separation or partial failure of its structure814 tests
- 4Non-component advisories: Child Seat fitted not allowing full inspection of adult belt526 tests
- 5Brake discs: significantly and obviously worn379 tests
- 6Brake discs: in such a condition that it is seriously weakened310 tests
- 7Non-component advisories: Nail in tyre306 tests
- 8Condition: has a cut in excess of the requirements deep enough to reach the ply or cords280 tests
Questions
What is the Mercedes-Benz Glb MOT pass rate?
91.6% of the 11,043 Mercedes-Benz Glb first-attempt MOTs in 2025 passed. The fail rate of 8.4% compares with 22.6% across all cars. A further 1.7% passed after a defect was fixed during the test visit.
What does a Mercedes-Benz Glb usually fail on?
The single most common failure is "Condition: has a cut in excess of the requirements deep enough to reach the ply or cords", recorded on 263 failed tests, followed by "Brake pads: less than 1.5 mm thick" and "Condition: has ply or cords exposed". By section, tyres appears in 53.4% of failures, brakes appears in 22.4% of failures, visibility appears in 9.4% of failures.
Does age change the odds?
Sharply. At 3 to 5 years old the fail rate was 8.6%; at 3-5 years it was 8.6%. The median Mercedes-Benz Glb tested in 2025 was 4 years old with 32,122 miles.
Is the Mercedes-Benz Glb getting less reliable?
The fail rate rose 0.5 points to 8.8% from 2023 to 2025, against a falling rate across all cars.
First-attempt class 4 tests, 2025, from DVSA’s anonymised MOT data (OGL v3, retrieved 2026-09-12). DVSA records newer cars trim by trim; this page adds every Glb trim together. Year-on-year figures come from the same DVSA extracts for 2026 and earlier years. Full method on the pass rates hub.
DVSA has published 30 safety recalls naming the Mercedes-Benz Glb: Mercedes-Benz Glb recalls.
Other Mercedes-Benz models
Checking a particular Glb?
The odds above are the model. The car in front of you has its own record: every test, every advisory, the mileage at each one.
Due a test? Find an approved MOT station near you.